Can you help to identify these frames, bikes or parts?

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Jay75

Just got some nice chainrings from Tel.
Marked as 'GBP' and 'USA', though it could be 'OBP'? They seem very well made, the outer ring is a slightly different type, but is 7075 alu Both are extensively machined. Anyone know the make?

It looks like an engagement ring from QBP

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